▎ 摘　　要

NOVELTY - Preparation of lithium-sulfur battery cathode material involves dispersing nano metal oxide in deionized water, adding graphene and stirring the mixed solution, adding nano-sulfur to deionized water, adding small amount of non-ionic surfactants, controlling nano sulfur and graphene mass ratio, adding liquid nitrogen, carrying out rapid cooling and solidification of product, transferring product to a freeze dryer, carrying out heat treatment under inert atmosphere and obtaining carbon black graphite wrapped nano metal oxide/nano sulfur composite material. USE - Preparation of lithium-sulfur battery cathode material (claimed). ADVANTAGE - The method enables the preparation of lithium-sulfur battery cathode material, which uniformly adheres nano sulfur particles on the surface of the graphene, improves the utilization of the cathode material, effectively inhibits the aggregation of graphene sheets, increases excellent conductivity of graphene, increases the power of composite material, effectively restrains the charging and discharging processes, exhibits high specific capacity and excellent cycle stability. The method provides simplified operation at low cost, and mass production. DETAILED DESCRIPTION - Preparation of lithium-sulfur battery cathode material involves dispersing nano metal oxide in deionized water, ultrasonically processing nano metal oxide in deionized water, adding graphene and stirring the mixed solution, mixing graphene and nano metal oxide in a mass ratio of 49:1-8:2, weighing certain amount of nano-sulfur and adding nano-sulfur to deionized water, adding small amount of non-ionic surfactants, controlling mass ratio of non-ionic surfactant and nano-sulfur to 1:999-1:99, adding nano sulfur dispersion to the mixture of graphene/nano metal oxide, controlling nano sulfur and graphene mass ratio to 8:2-1:9, adding liquid nitrogen, after carrying out ultrasonic dispersion in a thermal insulation cup, carrying out rapid cooling and solidification of product, transferring product to a freeze dryer for drying, carrying out heat treatment under inert atmosphere and obtaining carbon black graphite wrapped nano metal oxide/nano sulfur composite material.